So after washing the car I put the top down to vacuum the interior and noticed the driver side window didn't go down. This happened before but I don't remember if it was after washing the car but it started working the day after. I washed the car yesterday and it still doesn't work. The passenger side window works fine though. I know it's not the switch because it doesn't go down with the top and I can't hear the little click when I press the window switch.

If it's the motor how much would it cost to replace??